Dish w/ H-H motor; do I need more than 1 LNB?

[videobruce]

I'm looking at a 30" dish with a H-H motor. Would I need more than one LNB and should it be single or dual?
FTA uses circular polarization, correct? Dish/Bev uses linear which is H & V, correct? Did I get that right?

[Crow 492]

30" with linear and dual or single is your choice. You can use a single wene using the HH mortor.

[videobruce]

Dual is just for a 2nd receiver, not for dual polarity?